Recommended for you Facebook Twitter Google+LinkedInPinterestWhatsApp Related Items:Dominic Fedee, Grenada La Source Sandals, Sandals Grande Antigua Resort & Spa, Sandals Grande St Lucian, Sandals Regency La Toc, Sandals Resort International Sandals Resorts win top prizes at World Travel Awards Gala in Exuma Facebook Twitter Google+LinkedInPinterestWhatsAppProvidenciales, 24 Jul 2015 – The Turks and Caicos delegation is returned home now; landed and parked safely in that Sandals Resort International corporate jet at the Provo Air Center after a three day tour of the SRI properties in the Eastern Caribbean. Public Relations regional manager for the EC properties, Dominic Fedee talked about the objective of the second in a series of familiarization trips. “Well I think that we are often times misunderstood and I think that we need to communicate a lot better both us and the communities within which we operate. I think it means a whole lot to us that people understand what we’re trying to do, that they understand the heart and the soul and spirit of the company and the organization. Fedee continued: “It’s like I said earlier, it is a Caribbean company and we want to be seen as such where we are obligated and we are committed toward the development of the Caribbean’s people, its communities, its government so that overall as countries we can go forward and we can be very successful and we can be very, very formidable economies and societies in the world, so yes we want to be understood better and yes this is why we have invited people, I make no apologies for that.”The media fam trip first stopped into the Grenada La Source Sandals, moved on Monday evening to Sandals Barbados, took off on Tuesday late morning to St Lucia where two properties, Sandals Regency La Toc and Sandals Grande St Lucian were toured, with the trip wrapping up in Antigua and Barbuda which is the first Caribbean country, outside of Jamaica to have a Sandals couples’ resort – the site seen was the Sandals Grande Antigua Resort & Spa.
Citation: New materials undergo solid-liquid phase transitions at room temperature (2018, July 26) retrieved 18 August 2019 from https://phys.org/news/2018-07-materials-solid-liquid-phase-transitions-room.html The researchers, led by Brady Worrell, Christopher Bowman, and coauthors at the University of Colorado, Boulder, have published a paper on the materials with photoswitchable phases in a recent issue of Nature Communications.As we see in everyday life, conventional materials switch phases due to changes in temperature or pressure. For example, solid ice can be turned into liquid water by heating or—less commonly—by increasing the pressure (a higher pressure lowers the melting point, causing the ice to melt at colder temperatures than normal). Certain polymers, however, are permanently solid—even when exposed to extreme changes in temperature or pressure, they never become liquid. These materials, which are called covalently cross-linked polymers, can be modified so that an external stimulus such as light or heat causes them to switch from solid to liquid. However, this is only a temporary change, in which the polymer reverts back to its solid form as soon as the stimulus is removed.In the new study, the researchers presented two new polymers, one which starts as a solid and can be converted into liquid, and the other which starts as a liquid and can be converted into a solid. The polymers are the first materials of any kind that can undergo a permanent phase change in response to a stimulus other than temperature or pressure (in this case, light).The solid and liquid polymers both switch phase when irradiated by UV light with a 365-nm wavelength for about five minutes. However, the light affects the two materials differently. The liquid polymer initially contains a base that promotes a stress-relaxing thiol-thioester exchange reaction, which causes the polymer to act like a fluid, but the solid does not initially contain this base. When the solid polymer is exposed to light, the light releases a catalyst that releases the base, promoting the stress-relaxing reaction and converting the solid to a fluid. On the other hand, when the liquid polymer is exposed to light, the light releases a different catalyst that releases acid, neutralizing the base and halting the stress-relaxing reaction, which converts the liquid polymer into a solid.Using light instead of temperature or pressure to control the phase changes makes it possible to exert exquisite spatial control over these phase changes, allowing the researchers to define separate solid and liquid regions in a single material. To demonstrate, the researchers used nanoimprint lithography to design a photomask in the shape of a buffalo (the University of Colorado Boulder mascot). By using the two different wavelengths of light, they could make either a liquid buffalo on a solid background or a solid buffalo on a liquid background. Despite consisting of both liquid and solid, the material is stable and the liquid and solid portions remain permanently separate. The researchers expect that, in the future, these abilities will open the doors to a variety of new applications where polymers are used.”In a broad context, the thiol-thioester exchange in network polymers allows for wide-ranging application in a variety of fields,” Worrell told Phys.org. “This material effectively bridges the gap between thermoplastics and thermosets at very low operating temperatures, allowing for recycling, repurposing or remolding (thermoplastic behavior) and on-demand application to a substrate (thermoset behavior). This material will therefore likely have appeal in smart coatings applied on-demand where environmental stresses limit effectiveness.” By using light to switch the phase of the new photoswitchable materials, the researchers could spatially control the solid and liquid regions in a single material. The photomask of the buffalo is 2.5 x 2.5 cm. Credit: Worrell et al. Published in Nature Communications This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. read more